Ultra-small English encoders (17M, 68M and 395M) fine-tuned from Ettin rerankers. Each answers choice, noul and score questions with a probability per candidate and no generated text. Experimental v0 by one developer; the weights have no licence assigned yet.
An independent Jev-shaped reproduction on DeBERTa-v3-large. One state and any number of choice, score and yes/no questions go in, and a calibrated distribution per question comes out of one forward pass. Public gold labels only.
Decides
choice, noul, score
choice, score, noul, classify
Architecture
bekko
open-jev
Fine-tuned from
cross-encoder/ettin-reranker-400m-v1
microsoft/deberta-v3-large
License
Unassigned: the weights licence is not finalised (treated as non-commercial); training code MIT
apache-2.0
Availability
Open weights
Open weights
Hosted by
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Input price
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Decision accuracy
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85.4%
Calibration error
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0.022
Valid action rate
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Median latency
5 ms
28 ms
p95 latency
5.4 ms
Figures are from each model’s manifest; accuracy and latency are what the publishers report, on their own suites and hardware. Add a third model.
Questions
What is the difference between bekko-system-one and open-jev-deberta-v3-large?
bekko-system-one is from Yuichi Tateno (hotchpotch) and open-jev-deberta-v3-large from Kotoba Labs. Both have open weights you can download and run. Both answer choice, noul and score questions. Only open-jev-deberta-v3-large answers classify. bekko-system-one is the smaller model, at 395M parameters to 434M. bekko-system-one is licensed other; open-jev-deberta-v3-large, apache-2.0.
Which is more accurate, bekko-system-one or open-jev-deberta-v3-large?
Only open-jev-deberta-v3-large publishes an accuracy figure (85.4% on Kotoba held-out test, seen question types (banking77, SST-5, BoolQ)); bekko-system-one does not, so there is no comparison to make without your own test.
Which is cheaper, bekko-system-one or open-jev-deberta-v3-large?
bekko-system-one: Free (open weights). open-jev-deberta-v3-large: Free (open weights). Open weights cost nothing per call beyond your own hardware.
Which is faster, bekko-system-one or open-jev-deberta-v3-large?
By their publishers’ figures, bekko-system-one answers in about 5 ms at the median and open-jev-deberta-v3-large in about 28 ms — measured on different hardware, so treat it as a rough guide.
Can I run bekko-system-one or open-jev-deberta-v3-large locally?
Yes, both: systemone pull hotchpotch/bekko-system-one and systemone pull kotoba-labs/open-jev-deberta-v3-large download the weights.
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Evaluation suite
The maker's short-input speed probe (4-option Choice, RTX 5090, 1 Oct 2026)
Kotoba held-out test, seen question types (banking77, SST-5, BoolQ)
